Re: NULL pointer dereference

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Hello,
Sorry for the time i took to answer, but i was building the kernel
with different settings to test, and it takes time..
So with CONFIG_SND_HDA_POWER_SAVE=n it's even worse, not even
wvdialconf can be run as it gives a null pointer dereference (tried 3
times, rebooted everytime).
Tried to recompile then set to y but power_save value to 0 (just like
it is in ubuntu), and it runs wvdialconf but fails quickly after a
connection is accomplished, like before.
I remember i found a message some time ago of someone who had the same
problem, but never saw another message of him since that time :(
Anyway thanks for the help!
Kevin

2010/2/20, Nikolay Zhuravlev <xxor@xxxxxxx>:
> Kevin,
>
> You said previously:
>
>> >> disabled the SMP support, CONFIG_SND_HDA_POWER_SAVE was already unset
>> >> so i tried to set it as 0, using the new kernel i brought done all
>
> but this indicates the CONFIG_SND_HDA_POWER_SAVE option is still complied
> into the kernel:
>
>> CONFIG_SND_HDA_POWER_SAVE=y
>> CONFIG_SND_HDA_POWER_SAVE_DEFAULT=0
>
> Try to configure the kernel with CONFIG_SND_HDA_POWER_SAVE set to 'n',
> then rebuild/reinstall the kernel, reboot with the new kernel and
> rebuild/reinstall the driver.
>
> Maybe it will help.
>
> --
> Nick Zhuravlev
> www.auriga.com
>
> On Sat, Feb 20, 2010 at 02:36:08PM -0200, Kevin Fernandez
> <siegfri3d@xxxxxxxxx> wrote:
>
>> Hello Nikolay,
>> CONFIG_SND_HDA_POWER_SAVE=y
>> CONFIG_SND_HDA_POWER_SAVE_DEFAULT=0
>>
>> Yes i did rebuild the driver on the new kernel.
>>
>> Kevin
>>
>> 2010/2/18, Nikolay Zhuravlev <xxor@xxxxxxx>:
>> > Kevin,
>> >
>> >  What does the following command say:
>> >  $ grep CONFIG_SND_HDA_POWER_SAVE /boot/config-`uname -r`
>> >
>> >  Also, did you try to rebuild the driver under the new kernel?
>> >  I think portions of the driver depend on the
>> >  CONFIG_SND_HDA_POWER_SAVE option too. So the driver needs to
>> >  be rebuilt.
>> >
>> > cd <where the sources are>
>> > make clean
>> > make
>> > sudo make modules_install
>> > sudo modprobe agrmodem
>> > sudo modprobe agrserial
>> > sudo ln -sf /dev/ttyAGS3 /dev/modem
>> > sudo ln -sf /dev/ttyAGS3 /dev/ttySAGR
>> > sudo wvdialconf /etc/wvdial.conf
>> >
>> > --
>> > Nick Zhuravlev
>> > www.auriga.com
>> >
>> > On Wed, Feb 17, 2010 at 02:24:31AM -0200, Kevin Fernandez
>> > <siegfri3d@xxxxxxxxx> wrote:
>> >
>> >> Hello Nikolay,
>> >> First thanks for helping!
>> >>
>> >> I tried to recompile the kernel (2.6.31 of the ubuntu sources), i
>> >> disabled the SMP support, CONFIG_SND_HDA_POWER_SAVE was already unset
>> >> so i tried to set it as 0, using the new kernel i brought done all
>> >> interfaces, unloaded many modules, connected successfully, i could
>> >> ping and send 10 icmp packets but then the network stopped again and
>> >> pppd crashed (just like before), when reconnecting it gave me a
>> >> segfault (so again, just like before), the dmesg output is a bit
>> >> different:
>> >>
>> >> [  539.463626] ------------[ cut here ]------------
>> >> [  539.463629] kernel BUG at kernel/timer.c:762!
>> >> [  539.463631] invalid opcode: 0000 [#1]
>> >> [  539.463634] last sysfs file:
>> >> /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:0b/PNP0C09:00/PNP0C0A:00/power_supply/BAT1/voltage_now
>> >> [  539.463638] Modules linked in: ppp_async crc_ccitt agrserial
>> >> agrmodem isofs binfmt_misc snd_hda_codec_realtek snd_hda_intel
>> >> snd_hda_codec snd_hwdep snd_pcm snd_timer snd psmouse soundcore
>> >> snd_page_alloc fbcon tileblit font bitblit softcursor i915 drm
>> >> i2c_algo_bit intel_agp agpgart video output [last unloaded: mii]
>> >> [  539.463658]
>> >> [  539.463662] Pid: 9361, comm: wvdial Tainted: P           (2.6.31.9
>> >> #3) MSI Notebook VR601
>> >> [  539.463665] EIP: 0060:[<c013be43>] EFLAGS: 00210286 CPU: 0
>> >> [  539.463673] EIP is at add_timer+0x13/0x20
>> >> [  539.463675] EAX: fb576ae0 EBX: f97bed7c ECX: 00000000 EDX: f97beac0
>> >> [  539.463678] ESI: f97bed7c EDI: fffffff4 EBP: efb41d88 ESP: efb41d88
>> >> [  539.463680]  DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
>> >> [  539.463684] Process wvdial (pid: 9361, ti=efb40000 task=efb38c80
>> >> task.ti=efb40000)
>> >> [  539.463686] Stack:
>> >> [  539.463687]  efb41d90 fb44e04e efb41da0 fb508e7c fb508e37 f97bed7c
>> >> efb41dc0 fb508f05
>> >> [  539.463693] <0> 000003e8 00000000 00000000 00000000 12345678
>> >> f97bed7c efb41dc8 fb44e2b8
>> >> [  539.463698] <0> efb41dd0 fb44e2cd efb41de8 f97bcf60 fffffff4
>> >> efb41de8 f1bd61a4 f97bed7c
>> >> [  539.463704] Call Trace:
>> >> [  539.463739]  [<fb44e04e>] ? lt_add_timer+0x2e/0x30 [agrmodem]
>> >> [  539.463782]  [<fb508e7c>] ? VMODEM_Start_Timer+0x28/0x33 [agrmodem]
>> >> [  539.463822]  [<fb508e37>] ? timertick_function+0x0/0x1d [agrmodem]
>> >> [  539.463863]  [<fb508f05>] ? vxdPortOpen+0x3b/0x42 [agrmodem]
>> >> [  539.463893]  [<fb44e2b8>] ? wrap_vxdPortOpen+0x8/0x10 [agrmodem]
>> >> [  539.463921]  [<fb44e2cd>] ? modemPortOpen+0xd/0x20 [agrmodem]
>> >> [  539.463927]  [<f97bcf60>] ? serial8250_startup+0x1b0/0x370
>> >> [agrserial]
>> >> [  539.463933]  [<c0363792>] ? uart_startup+0x42/0x130
>> >> [  539.463937]  [<c0363d68>] ? uart_open+0xd8/0x340
>> >> [  539.463941]  [<c034bbb6>] ? tty_init_dev+0x76/0x140
>> >> [  539.463946]  [<c01d8a06>] ? mntput_no_expire+0x16/0x80
>> >> [  539.463949]  [<c034be1f>] ? tty_open+0x19f/0x430
>> >> [  539.463953]  [<c01c6f7a>] ? chrdev_open+0x8a/0x120
>> >> [  539.463958]  [<c01c241a>] ? __dentry_open+0xaa/0x220
>> >> [  539.463962]  [<c01c2675>] ? nameidata_to_filp+0x55/0x70
>> >> [  539.463965]  [<c01c6ef0>] ? chrdev_open+0x0/0x120
>> >> [  539.463969]  [<c01cf7e5>] ? do_filp_open+0x535/0x8f0
>> >> [  539.463973]  [<c01cc465>] ? getname+0x25/0xf0
>> >> [  539.463977]  [<c01c21b0>] ? do_sys_open+0x50/0x160
>> >> [  539.463981]  [<c01c5a45>] ? fput+0x15/0x20
>> >> [  539.463984]  [<c01c2329>] ? sys_open+0x29/0x40
>> >> [  539.463988]  [<c010332c>] ? syscall_call+0x7/0xb
>> >> [  539.463990] Code: 40 2b 6e c0 8b 80 08 02 00 00 89 41 2c e9 36 ff
>> >> ff ff 8d b6 00 00 00 00 55 8b 10 89 e5 85 d2 75 0a 8b 50 08 e8 ef fe
>> >> ff ff 5d c3 <0f> 0b eb fe 89 f6 8d bc 27 00 00 00 00 55 89 e5 e8 18 97
>> >> ff ff
>> >> [  539.464019] EIP: [<c013be43>] add_timer+0x13/0x20 SS:ESP
>> >> 0068:efb41d88
>> >> [  539.464060] ---[ end trace c38ee2fc1c238c35 ]---
>> >>
>> >> I'll try to see if i can get some logs of pppd when it crashes.
>> >>
>> >> Any idea would be appreciated!
>> >> Thanks,
>> >> Kevin
>> >>
>> >> 2010/2/16, Nikolay Zhuravlev <xxor@xxxxxxx>:
>> >> > Things to try that come to my mind:
>> >> >
>> >> > - try a non-SMP kernel
>> >> > - try to build the kernel with the
>> >> >   CONFIG_SND_HDA_POWER_SAVE unset
>> >> > - try to bring down other interfaces (eth0, wlan0)
>> >> >   before using the modem
>> >> >
>> >> > --
>> >> > Nick Zhuravlev
>> >> > www.auriga.com
>> >> >
>> >> > On Sun, Feb 14, 2010 at 08:51:02PM -0200, Kevin Fernandez
>> >> > <siegfri3d@xxxxxxxxx> wrote:
>> >> >
>> >> >> Almost there!
>> >> >> I don't know if it's your change (probably!); as i also upgraded to
>> >> >> the variant 2.6.31-20-generic.
>> >> >> I could run wvdialconf without problem, then i tried multiple times
>> >> >> to
>> >> >> connect but right after connecting to the first site it was always
>> >> >> crashing wvdial/pppd (i could see that it resolved the site in
>> >> >> firefox
>> >> >> and was trying to connect to it).
>> >> >> After trying another time i got a segmentation fault:
>> >> >>
>> >> >> --> WvDial: Internet dialer version 1.60
>> >> >> --> Initializing modem.
>> >> >> --> Sending: ATZ
>> >> >> ATZ
>> >> >> OK
>> >> >> --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
>> >> >> ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
>> >> >> OK
>> >> >> --> Modem initialized.
>> >> >> --> Sending: ATDT17003131
>> >> >> --> Waiting for carrier.
>> >> >> ATDT17003131
>> >> >> BUSY
>> >> >> --> The line is busy. Trying again.
>> >> >> --> Sending: ATDT17003131
>> >> >> --> Waiting for carrier.
>> >> >> ATDT17003131
>> >> >> CONNECT 40000 V44
>> >> >> --> Carrier detected.  Waiting for prompt.
>> >> >> ~[7f]}#@!}!}!} }8}"}&} }*} } }#}$@#}%}&(BAh}'}"}(}"[0c]J~
>> >> >> --> PPP negotiation detected.
>> >> >> --> Starting pppd at Sun Feb 14 20:17:40 2010
>> >> >> --> Pid of pppd: 16639
>> >> >> --> Using interface ppp0
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> local  IP address 189.48.97.120
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> remote IP address 201.4.82.93
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> primary   DNS address 200.202.193.75
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> secondary DNS address 200.222.0.34
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> Connect time 1.1 minutes.
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> pppd: px2[08]@[7f]2[08]
>> >> >> --> Disconnecting at Sun Feb 14 20:18:47 2010
>> >> >> --> The PPP daemon has died: A modem hung up the phone (exit code =
>> >> >> 16)
>> >> >> --> man pppd explains pppd error codes in more detail.
>> >> >> --> Try again and look into /var/log/messages and the wvdial and
>> >> >> pppd
>> >> >> man pages for more information.
>> >> >> --> Auto Reconnect will be attempted in 5 seconds
>> >> >> --> Initializing modem.
>> >> >> --> Sending: ATZ
>> >> >> ATZ
>> >> >> OK
>> >> >> --> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
>> >> >> ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
>> >> >> OK
>> >> >> --> Modem initialized.
>> >> >> Erreur de segmentation
>> >> >>
>> >> >>
>> >> >>
>> >> >> dmesg:
>> >> >>
>> >> >> [ 1348.660145] ------------[ cut here ]------------
>> >> >> [ 1348.660150] kernel BUG at
>> >> >> /build/buildd/linux-2.6.31/kernel/timer.c:762!
>> >> >> [ 1348.660154] invalid opcode: 0000 [#1] SMP
>> >> >> [ 1348.660159] last sysfs file:
>> >> >> /sys/devices/system/cpu/cpu1/topology/core_id
>> >> >> [ 1348.660162] Modules linked in: ppp_deflate zlib_deflate bsd_comp
>> >> >> ppp_async crc_ccitt agrserial agrmodem isofs udf crc_itu_t
>> >> >> binfmt_misc
>> >> >> ppdev vboxnetflt vboxnetadp vboxdrv joydev snd_hda_codec_realtek
>> >> >> wlan_scan_sta ath_rate_sample iptable_nat nf_nat nf_conntrack_ipv4
>> >> >> nf_conntrack nf_defrag_ipv4 iptable_mangle snd_hda_intel
>> >> >> snd_hda_codec
>> >> >> snd_hwdep iptable_filter pcmcia ip_tables x_tables snd_pcm_oss
>> >> >> snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss sdhci_pci sdhci
>> >> >> led_class yenta_socket rsrc_nonstatic pcmcia_core snd_seq_midi
>> >> >> snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd
>> >> >> ath_pci wlan ath_hal psmouse serio_raw soundcore snd_page_alloc sbp2
>> >> >> lp parport dm_raid45 xor fbcon tileblit font bitblit softcursor i915
>> >> >> drm i2c_algo_bit ohci1394 ieee1394 r8169 mii intel_agp agpgart video
>> >> >> output
>> >> >> [ 1348.660246]
>> >> >> [ 1348.660251] Pid: 16129, comm: wvdial Tainted: P
>> >> >> (2.6.31-20-generic #57-Ubuntu) MSI Notebook VR601
>> >> >> [ 1348.660255] EIP: 0060:[<c0150bb3>] EFLAGS: 00010286 CPU: 1
>> >> >> [ 1348.660262] EIP is at add_timer+0x13/0x20
>> >> >> [ 1348.660265] EAX: fbaaebc0 EBX: f851ae28 ECX: 00000000 EDX:
>> >> >> f851ab60
>> >> >> [ 1348.660268] ESI: f851ae28 EDI: fffffff4 EBP: ec82dd88 ESP:
>> >> >> ec82dd88
>> >> >> [ 1348.660272]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
>> >> >> [ 1348.660275] Process wvdial (pid: 16129, ti=ec82c000 task=ec838000
>> >> >> task.ti=ec82c000)
>> >> >> [ 1348.660278] Stack:
>> >> >> [ 1348.660280]  ec82dd90 fb98604e ec82dda0 fba40ebc fba40e77
>> >> >> f851ae28
>> >> >> ec82ddc0 fba40f45
>> >> >> [ 1348.660289] <0> 000003e8 00000000 00000000 00000000 12345678
>> >> >> f851ae28 ec82ddc8 fb9862f8
>> >> >> [ 1348.660298] <0> ec82ddd0 fb98630d ec82dde8 f8518fe0 fffffff4
>> >> >> ec82dde8 ef86be04 f851ae28
>> >> >> [ 1348.660309] Call Trace:
>> >> >> [ 1348.660346]  [<fb98604e>] ? lt_add_timer+0x2e/0x30 [agrmodem]
>> >> >> [ 1348.660389]  [<fba40ebc>] ? VMODEM_Start_Timer+0x28/0x33
>> >> >> [agrmodem]
>> >> >> [ 1348.660432]  [<fba40e77>] ? timertick_function+0x0/0x1d
>> >> >> [agrmodem]
>> >> >> [ 1348.660473]  [<fba40f45>] ? vxdPortOpen+0x3b/0x42 [agrmodem]
>> >> >> [ 1348.660504]  [<fb9862f8>] ? wrap_vxdPortOpen+0x8/0x10 [agrmodem]
>> >> >> [ 1348.660533]  [<fb98630d>] ? modemPortOpen+0xd/0x20 [agrmodem]
>> >> >> [ 1348.660540]  [<f8518fe0>] ? serial8250_startup+0x210/0x380
>> >> >> [agrserial]
>> >> >> [ 1348.660548]  [<c039d0d6>] ? uart_startup+0x46/0x140
>> >> >> [ 1348.660552]  [<c039dc12>] ? uart_open+0x102/0x220
>> >> >> [ 1348.660557]  [<c0384d13>] ? __tty_open+0x1a3/0x460
>> >> >> [ 1348.660562]  [<c0384fef>] ? tty_open+0x1f/0x40
>> >> >> [ 1348.660568]  [<c01eae1d>] ? chrdev_open+0xcd/0x190
>> >> >> [ 1348.660572]  [<c01e5df9>] ? __dentry_open+0xb9/0x230
>> >> >> [ 1348.660577]  [<c01e6055>] ? nameidata_to_filp+0x55/0x70
>> >> >> [ 1348.660581]  [<c01ead50>] ? chrdev_open+0x0/0x190
>> >> >> [ 1348.660587]  [<c01f3daa>] ? do_filp_open+0x53a/0x890
>> >> >> [ 1348.660592]  [<c01e5b90>] ? do_sys_open+0x50/0x150
>> >> >> [ 1348.660597]  [<c01e9645>] ? fput+0x15/0x20
>> >> >> [ 1348.660601]  [<c01e5a67>] ? filp_close+0x47/0x70
>> >> >> [ 1348.660605]  [<c01e5cf9>] ? sys_open+0x29/0x40
>> >> >> [ 1348.660610]  [<c01033ac>] ? syscall_call+0x7/0xb
>> >> >> [ 1348.660612] Code: 8b 80 08 02 00 00 89 43 2c e9 fa fe ff ff 0f 0b
>> >> >> eb fe 8d b6 00 00 00 00 55 8b 10 89 e5 85 d2 75 0a 8b 50 08 e8 af fe
>> >> >> ff ff 5d c3 <0f> 0b eb fe 89 f6 8d bc 27 00 00 00 00 55 89 e5 e8 98
>> >> >> 8c
>> >> >> ff ff
>> >> >> [ 1348.660669] EIP: [<c0150bb3>] add_timer+0x13/0x20 SS:ESP
>> >> >> 0068:ec82dd88
>> >> >> [ 1348.660677] ---[ end trace e3d2e7c757a613b0 ]---
>> >> >>
>> >> >>
>> >> >> Any idea?
>> >> >> Thanks for the help!
>> >> >>
>> >> >> 2010/2/14, Nikolay Zhuravlev <xxor@xxxxxxx>:
>> >> >> > I am not sure. I think power_save=0 means that
>> >> >> > there is no timeout and snd-hda-intel never sleeps.
>> >> >> >
>> >> >> > My previous kernel (vanilla 2.6.32) did not have
>> >> >> > CONFIG_SND_HDA_POWER_SAVE set, so the power_save was
>> >> >> > not even an option, and it all worked fine.
>> >> >> >
>> >> >> > There are also bug reports of some high pitch noise
>> >> >> > related to the power_save=10 setting, both in Fedora
>> >> >> > and in Ubuntu.
>> >> >> >
>> >> >> > --
>> >> >> > Nick Zhuravlev
>> >> >> > www.auriga.com
>> >> >> >
>> >> >> > On Sun, Feb 14, 2010 at 02:26:08PM -0400, Bjorn Wielens
>> >> >> > <Uniacke1@xxxxxxxx>
>> >> >> > wrote:
>> >> >> >
>> >> >> >> so it looks like if the hda driver is in a sleep state, the agrsm
>> >> >> >> driver
>> >> >> >> has a fit.
>> >> >> >>
>> >> >> >>
>> >> >> >> I just verified that my SuSE distro does not set the power save
>> >> >> >> in
>> >> >> >> modprobe, hence it worked fine out of the box for me.
>> >> >> >>
>> >> >> >> That said, it must be possible to modify the driver code to
>> >> >> >> "wake"
>> >> >> >> the
>> >> >> >> sound card properly- I know for a fact that it has function
>> >> >> >> prototypes
>> >> >> >> for powerup/powerdown functions.
>> >> >> >>
>> >> >> >> Bjorn.
>> >> >> >>
>> >> >> >>
>> >> >> >> On 02/14/2010 01:57 PM, Nikolay Zhuravlev wrote:
>> >> >> >> > Valera,
>> >> >> >> >
>> >> >> >> > Glad it worked for you.  It is amazing how much difference a
>> >> >> >> > single
>> >> >> >> > bit of information can make ;)
>> >> >> >> >
>> >> >> >>
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >
>> >
>

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